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Q: Fachverband Quantenoptik und Photonik

Q 62: Ultra-cold atoms, ions and BEC (joint session A/Q)

Q 62.1: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Ultracold Feshbach molecules in orbital optical lattices — •Yann Kiefer, Max Hachmann, and Andreas Hemmerich — Luruper Chaussee 149, 22761 Hamburg

Spin-polarized samples and spin mixtures of quantum degenerate fermionic atoms are prepared in selected excited Bloch bands of an optical chequerboard square lattice. For the spin-polarized case, extreme band lifetimes above 10 s are observed, reflecting the suppression of collisions by Pauli*s exclusion principle. For spin mixtures, lifetimes are reduced by an order of magnitude by two-body collisions between different spin components, but still remarkably large values of about one second are found. By analyzing momentum spectra, we can directly observe the orbital character of the optical lattice. The observations demonstrated here form the basis for exploring the physics of Fermi gases with two paired spin components in orbital optical lattices, including the regime of unitarity. Furthermore access to a broad Feshbach resonance enables to study the role of interaction and pairing of ultracold molecular orbital optical lattices.